SIST EN 12420:2014

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Baker in bakrove zlitine - IzkovkiKupfer und Kupferlegierungen - SchmiedestückeCuivre et alliages de cuivre - Pièces forgéesCopper and copper alloys - Forgings77.150.30Bakreni izdelkiCopper productsICS:Ta slovenski standard je istoveten z:EN 12420:2014SIST EN 12420:2014en,fr,de01-september-2014SIST EN 12420:2014SLOVENSKI
STANDARDSIST EN 12420:19991DGRPHãþD



SIST EN 12420:2014



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12420
June 2014 ICS 77.150.30 Supersedes EN 12420:1999English Version
Copper and copper alloys - Forgings
Cuivre et alliages de cuivre - Pièces forgées
Kupfer und Kupferlegierungen - Schmiedestücke This European Standard was approved by CEN on 24 April 2014.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12420:2014 ESIST EN 12420:2014



EN 12420:2014 (E) 2 Contents Page Foreword .4 Introduction .6 1 Scope .7 2 Normative references .7 3 Terms and definitions .7 4 Designations .8 4.1 Material .8 4.1.1 General .8 4.1.2 Symbol .8 4.1.3 Number .8 4.2 Material condition .8 4.3 Product .8 5 Ordering information . 10 6 Requirements . 10 6.1 Composition . 10 6.2 Mechanical properties . 11 6.2.1 Hardness properties . 11 6.2.2 Tensile properties . 11 6.3 Electrical properties . 11 6.4 Resistance to dezincification . 11 6.5 Residual stress level . 11 6.6 Tolerances for die forgings . 11 6.6.1 General . 11 6.6.2 Tolerances for dimensions within the die cavity and for dimensions across the die parting line . 12 6.6.3 Mismatch . 13 6.6.4 Flash projection . 14 6.6.5 Ejector marks . 15 6.6.6 Flatness tolerances . 15 6.6.7 Angular tolerances . 16 6.7 Tolerances for cored forgings . 16 6.8 Tolerances for hand forgings . 17 6.8.1 General . 17 6.8.2 Tolerances on dimensions . 18 6.8.3 Flatness tolerance . 18 6.9 Surface quality . 19 6.10 Drawings . 19 7 Sampling . 19 7.1 General . 19 7.2 Analysis . 19 7.3 Hardness, stress corrosion resistance, dezincification resistance and electrical property tests . 20 8 Test methods . 20 8.1 Analysis . 20 8.2 Hardness test . 20 SIST EN 12420:2014



EN 12420:2014 (E) 3 8.3 Electrical conductivity test . 20 8.4 Dezincification resistance test . 20 8.5 Stress corrosion resistance test . 20 8.6 Retests . 21 8.6.1 Analysis, hardness, electrical conductivity and dezincification resistance tests . 21 8.6.2 Stress corrosion resistance test . 21 8.7 Rounding of results . 21 9 Declaration of conformity and inspection documentation . 21 9.1 Declaration of conformity . 21 9.2 Inspection documentation . 21 10 Marking, labelling, packaging . 22 Annex A (informative)
Recommended guidelines for design . 39 A.1 Introduction . 39 A.2 General information . 39 A.3 Guidelines for die forgings . 40 A.3.1 Drafts . 40 A.3.2 Web thicknesses . 40 A.3.3 Side wall thicknesses . 41 A.3.4 Rib design . 42 A.3.5 Cores . 43 A.3.6 Flash . 44 A.3.7 Transition radii . 45 A.3.8 Clamping lengths and clamping areas for finish machining . 47 A.3.9 Design for cross-sectional shapes . 47 A.3.10 Recommended machining allowances and total allowances . 48 A.4 Guidelines for hand forgings . 50 A.4.1 General . 50 A.4.2 General information . 50 A.4.3 Section changes and transitions . 51 A.4.4 Recommended machining allowances . 51 A.4.5 Total allowances per side of forging . 52 A.5 Guidelines for marking . 52 Annex B (informative)
Tensile properties . 54 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC, Pressure Equipment Directive (PED) . 58 Bibliography . 59
SIST EN 12420:2014



EN 12420:2014 (E) 4 Foreword This document (EN 12420:2014) has been prepared by Technical Committee CEN/TC 133 “Copper and copper alloys”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2014 and conflicting national standards shall be withdrawn at the latest by December 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12420:1999. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Pressure Equipment Directive (PED) 97/23/EC. For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of this document. This is one of a series of European Standards for the copper and copper alloy products rod, wire, profile and forgings. Other products are specified as follows: — EN 12163, Copper and copper alloys — Rod for general purposes; — EN 12164, Copper and copper alloys — Rod for free machining purposes; — EN 12165, Copper and copper alloys — Wrought and unwrought forging stock; — EN 12166, Copper and copper alloys — Wire for general purposes; — EN 12167, Copper and copper alloys — Profiles and rectangular bars for general purposes; — EN 12168, Copper and copper alloys — Hollow rod for free machining purposes. Within its programme of work, Technical Committee CEN/TC 133 requested CEN/TC 133/WG 4 “Extruded and drawn products, forgings and scrap” to revise the following standard: EN 12420:1999, Copper and copper alloys — Forgings. In comparison with EN 12420:1999, the following significant technical changes were made: 1) new text has been introduced concerning optional restrictions to chemical compositions of materials with respect to individual uses or regulations for the use in contact with drinking water; 2) materials have been considered coherently with EN 12165:2011; 3) four new materials have been added: CuZn35Pb1,5AlAs (CW625N), CuZn33Pb1,5AlAs (CW626N), CuZn21Si3P (CW724R) and CuZn33Pb1AlSiAs (CW725R); 4) the mechanical properties have been modified to reflect market needs; 5) an informative Annex B Tensile properties has been introduced. SIST EN 12420:2014



EN 12420:2014 (E) 5 According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12420:2014



EN 12420:2014 (E) 6 Introduction The European Committee for Standardization (CEN) draws attention to the fact that it is claimed that compliance with this document may involve the use of a patent concerning the alloys CuZn21Si3P (CW724R) and CuZn33Pb1AlSiAs (CW725R). CEN takes no position concerning the evidence, validity and scope of this patent right. The holder of this patent right has ensured the CEN that he/she is willing to negotiate licences under reasonable and not-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this patent right is registered with CEN. — For CuZn21Si3P (CW724R) information may be obtained from: Wieland-Werke AG Graf Arco Straße 36 89079 Ulm GERMANY — For CuZn33Pb1AlSiAs (CW725R) information may be obtained from: Diehl Metall Messing Heinrich-Diehl-Straße 9 D-90552 Röthenbach/Pegnitz GERMANY Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. CEN shall not be held responsible for identifying any or all such patent rights. CEN (http://www.cen.eu/cen/WorkArea/IPR/Pages/default.aspx) and CENELEC (http://www.cenelec.eu/membersandexperts/toolsandapplications/index.html) maintain on-line lists of patents relevant to their standards. Users are encouraged to consult the lists for the most up to date information concerning patents. Due to developing legislation, the composition of a material may be restricted to the composition specified in this European Standard with respect to individual uses (e.g. for the use in contact with drinking water in some Member States of the European Union). These individual restrictions are not part of this European Standard. Nevertheless, for materials for which traditional and major uses are affected, these restrictions are indicated. The absence of an indication, however, does not imply that the material can be used in any application without any legal restriction. SIST EN 12420:2014



EN 12420:2014 (E) 7 1 Scope This European Standard specifies the composition, the property requirements and tolerances on dimensions and form for copper and copper alloy die and hand forgings. The sampling procedures, the methods of test for verification of conformity to the requirements of this standard, and the delivery conditions are also specified. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1173, Copper and copper alloys — Material condition designation EN 1655, Copper and copper alloys — Declarations of conformity EN 1976, Copper and copper alloys — Cast unwrought copper products EN 10204:2004, Metallic products — Types of inspection documents EN 14977, Copper and copper alloys — Detection of tensile stress — 5 % ammonia test EN ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method (ISO 6506-1) EN ISO 6509, Corrosion of metals and alloys — Determination of dezincification resistance of brass (ISO 6509) ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 forging wrought product, hot formed by hammering or pressing 3.1.1 die forging forging produced between closed dies 3.1.2 hand forging forging produced between open dies 3.1.3 cored forging forging produced between closed dies including cores SIST EN 12420:2014



EN 12420:2014 (E) 8 3.2 deviation from concentricity half of the difference between the maximum and the minimum wall thickness (smax and smin), measured in the same plane perpendicular to the axis of the forging Note 1 to entry: Deviation from concentricity (mm) = (smax − smin)/2. 3.3 inspection lot definite quantity of products of the same cross-sectional dimensions, the same material and material condition, collected together for inspection (testing) 4 Designations 4.1 Material 4.1.1 General The material is designated either by symbol or number (see Tables 1 to 8). 4.1.2 Symbol The material symbol designation is based on the designation system given in ISO 1190-1. NOTE Although material symbol designations used in this standard might be the same as those in other standards using the designation system given in ISO 1190-1, the detailed composition requirements are not necessarily the same. 4.1.3 Number The material number designation is in accordance with the system given in EN 1412. 4.2 Material condition For the purposes of this standard, the following designations, which are in accordance with the system given in EN 1173, apply for the material condition: M Material condition for the product as manufactured without specified mechanical properties; H. Material condition designated by the minimum value of hardness requirement for the product with mandatory hardness requirements; S (suffix) Material condition for a product which is stress relieved. Products in the M or H. condition may be specially processed (i.e. mechanically or thermally stress relieved) in order to lower the residual stress level to improve the resistance to stress corrosion and the dimensional stability on machining [see Clause 5, list entry g) and list entry h)]. Except when the suffix S is used, material condition is designated by only one of the above designations. 4.3 Product The product designation provides a standardized pattern of designation from which a rapid and unequivocal description of a product is conveyed in communication. It provides mutual comprehension at the international level with regard to products which meet the requirements of the relevant European Standard. SIST EN 12420:2014



EN 12420:2014 (E) 9 The product designation is no substitute for the full content of the standard. The product designation for products to this standard shall consist of: — denomination (Forging); — number of this European Standard (EN 12420); — material designation, either symbol or number (see Tables 1 to 8); — for the use in contact with drinking water: DW for compliance in the chemical composition according to 4 MS Common Composition List; — material condition designation (see Tables 9 and 10). The derivation of a product designation is shown in the following examples. EXAMPLE 1 Forging conforming to this standard, in material designated either CuZn40Pb2 or CW617N, for standard applications, in material condition H070, will be designated as follows:
EXAMPLE 2 Forging conforming to this standard, in material designed either CuZn40Pb2 or CW617N, for the use in contact with drinking water DW, in material condition H070, will be designated as follows:
SIST EN 12420:2014



EN 12420:2014 (E) 10 5 Ordering information In order to facilitate the enquiry, order and confirmation of order procedures between the purchaser and the supplier, the purchaser shall state on his enquiry and order the following information: a) quantity of product required (mass or number of pieces); b) denomination (Forging); c) number of this European Standard (EN 12420); d) material designation (see Tables 1 to 8); e) material condition designation (see 4.2 and Tables 9 and 10) if it is other than M; f) for the use in contact with drinking water: DW for compliance in the chemical composition according to 4 MS Common Composition List; g) nominal dimensions and/or tolerance drawing of the forging or finished part including the number of the drawing (see 6.6): It is recommended that the product designation, as described in 4.3, is used for items b) to e). In addition, the purchaser shall also state on the enquiry and order any of the following, if required: h) whether the products are required to pass a stress corrosion resistance test. If so, which test method is to be used (see 8.5) if the choice is not to be left to the discretion of the supplier. If the purchaser chooses ISO 6957, the pH value for the test solution is to be selected; i) whether the products are to be supplied in a thermally stress relieved condition; j) when requested, tensile properties have to be agreed between purchaser and supplier (see 6.2.2 and Tables B.1 to B.3); k) whether a declaration of conformity is required (see 9.1); l) whether an inspection document is required, and if so, which type (see 9.2); m) whether there are any special requirements for marking, labelling or packaging (see Clause 10). EXAMPLE Ordering details for 200 forgings conforming to EN 12420, in material designated either CuZn40Pb2 or CW617N, for the use in contact with drinking water DW, in material condition H070, according to drawing number XY000:
200 pieces Forging EN 12420 — CuZn40Pb2 — DW — H070 — drawing number XY000
or
200 pieces Forging EN 12420 — CW617N — DW — H070 — drawing number XY000 6 Requirements 6.1 Composition The composition shall conform to the requirements for the appropriate material given in Tables 1 to 8. In the same tables the hot working attitude is also reported. SIST EN 12420:2014



EN 12420:2014 (E) 11 Due to developing legislation, specific applications (see 4.3) may require restrictions in the chemical composition. In this case the limitations shall be stated in the ordering information [see Clause 5 list entry f)]. NOTE As the materials specified in this standard vary considerably e.g. in their resistance to forming, forging temperature and pressure, die wear and stresses, they have been classified into three groups of similar hot working attitudes (I, II or III in descending order of hot working attitude). A direct proportionality exists between the group and preheating temperature. 6.2 Mechanical properties 6.2.1 Hardness properties The hardness properties shall conform to the appropriate requirements given in Tables 9 and 10. For the alloys not mentioned in these tables the hardness values shall be agreed between purchaser and supplier. 6.2.2 Tensile properties This standard does not specify mandatory tensile properties. The values for the tensile properties given in Tables B.1 to B.3 are for information only. 6.3 Electrical properties Forgings materials listed in Table 11 shall conform to the electrical properties specified in the same table. 6.4 Resistance to dezincification The maximum depth of dezincification, in any direction, of CuZn38As (CW511L), CuZn36Pb2As (CW602N), CuZn35Pb1,5AlAs (CW625N), CuZn33Pb1,5AlAs (CW626N), CuZn32Pb2AsFeSi (CW709R), CuZn21Si3P (CW724R) and CuZn33Pb1AlSiAs (CW725R) products shall be 150 µm.
phase for CuZn38As (CW511L), CuZn36Pb2As (CW602N), CuZn35Pb1,5AlAs (CW625N), CuZn33Pb1,5AlAs (CW626N), CuZn32Pb2AsFeSi (CW709R) and CuZn33Pb1AlSiAs (CW725R) shall be less than 3 %. The test shall be carried out in accordance with 8.4. NOTE The supplied material for forgings may not necessarily meet this requirement unless suitably heat treated. The test is intended to demonstrate that forgings produced are capable of being processed so as to pass the test requirement. Products in alloys other than CuZn21Si3P (CW724R) shall be subjected to heat treatment approximately in the range 500 °C to 550 °C after hot stamping. Should the user need to heat the material above 530 °C (i.e. soldering, brazing or welding operations) then advice should be sought from the supplier. 6.5 Residual stress level Forgings ordered in the stress relieved condition (see 4.2, 2nd paragraph) shall show no evidence of cracking when tested. The tests shall be carried out in accordance with 8.5. 6.6 Tolerances for die forgings 6.6.1 General Tolerances on dimensions and on form indicated in the drawings of a forging shall conform to the tolerances specified in this standard. If no tolerances are indicated in the drawings, the tolerances according to SIST EN 12420:2014



EN 12420:2014 (E) 12 ISO 2768-1, Tolerance Class c, shall apply. When more than one general tolerance is applicable, the larger of the possible general tolerances shall be used. It is recommended that reference to this standard is made on the drawings. Two different types of dimensions are distinguished for die forgings: a) dimensions within the die cavity which originate from the forging shape in one separate die part and which does not have compone
...